What matter will hold it's shape without a container

When objects are charged by they do not need to touch each other. a. friction b. induction c. conduction d. all of these

Sound is a disturbance that travels through a medium as a

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?